/**
 * Copyright 2011 FeedDreamwork SIG
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.feeddreamwork.processors;

import java.io.*;
import java.util.*;
import java.util.regex.*;

import org.feeddreamwork.*;
import org.feeddreamwork.feed.*;
import org.feeddreamwork.fetcher.*;

public class MergeHtmlProcessor implements FeedProcessor {
	private String url, regex;

	public MergeHtmlProcessor(String url, String regex) {
		Utils.throwIfNullOrEmpty(url);
		this.url = url;
		this.regex = regex;
	}

	@Override
	public void process(FeedContext context) throws FeedProcessException {
		Utils.throwIfNull(context);
		Utils.throwIfNull(context.getFeed());

		try {
			HttpFetcher fetcher = new HttpFetcher(url);
			Feed result = parse(fetcher.getContent(), url);
			for (Entry entry : result.getEntries())
				context.getFeed().getEntries().add(entry.clone());
		} catch (IOException e) {
			throw new FeedProcessException();
		}
	}

	private Feed parse(String content, String url)
			throws FeedProcessException {
		Feed feed = new Feed(" ", url);
		Matcher mat = Pattern.compile(regex).matcher(content);
		while (mat.find())
			feed.getEntries().add(new Entry(" ", " ", mat.group(), " ", new Date(0)));
		return feed;
	}
}
